Sammy Adebiyi (please follow him on Twitter: @SammyAdebiyi or on Facebook) has an interesting post about friendships and people being there for you. I'm tempted to disagree because looking over my life, I've more been there for people than I have seen people be there for me. Or maybe my idea of people being there for me is unrealistic. Still, it's a very interesting read. I suggest you read it.
I also recommend his post on being a loser. Just for context.